fix: aria-label attr and add noreferrer in anchor rel attr

[stabldev]

Summary

Added aria-label attribute to mobile menu button for screen readers.
Include noreferrer to anchor tags rel attribute with target _blank for old browser support.

Motivation

When the link is opened in a new tab, the referrer information is sent in the referer header and some sensitive data may be exposed in the url to the target site. noreferrer option alone is enough for modern browsers, but including both works perfectly for some old browsers.

Change Type

• 🐞 Bug fix (non-breaking fix for an issue)
• ✨ Feature (non-breaking addition)
• 🧹 Refactor (non-breaking improvements, no behavior change)
• 💥 Breaking change (fix or feature that would change existing functionality)

Checklist

• I’ve read the Contributing Guidelines
• My code matches the project’s coding style (npm run lint)
• My change introduces changes to the documentation
• I’ve updated documentation where needed
• I’ve added tests covering new behavior
• All existing and new tests pass

Related Issues

• Closes Add aria-label="Toggle menu" to mobile menu toggle button for improved accessibility #21

[MohamadSalman11]

@moonlitgrace Looks great — thanks for your improvements!